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对纤芯附近引入两个大孔的光子晶体保偏光纤(PM-PCF)双折射特性进行分析,通过调节大孔直径和小孔直径,给出PM-PCF最优化的设计参数。同时,在包层采用选择性填充方法,使双折射进一步提高。采用有限元法(FEM),模拟并分析了该光纤的偏振特性和基模模场分布。研究表明:采用本文方法使PM-PCF的模式双折射比普通PM-PCF提高了1个数量级,研究结果为高双折射PM-PCF的设计与研制提供了一种有效的理论分析方法。
The birefringence characteristics of PM-PCF with two macropores introduced near the fiber core were analyzed. The optimum design parameters of PM-PCF were given by adjusting the macropore diameter and the pinhole diameter. At the same time, the selective filling method is used in the cladding to further enhance the birefringence. The finite element method (FEM) was used to simulate and analyze the polarization characteristics and mode field distribution of the fiber. The results show that the modal birefringence of PM-PCF is improved by one order of magnitude compared with the conventional PM-PCF. The results provide an effective theoretical analysis method for the design and development of high-birefringence PM-PCF.